Granted Patent B1

US 9,177,585 · App. 14/096,332 · Granted Nov 3, 2015

Abstract

Claims (50)

1. A magnetic recording media usable in a heat assisted magnetic recording (HAMR) disk drive, the magnetic recording comprising:

a magnetic recording layer for storing magnetic data;

a crystalline underlayer having a first crystal structure, the crystalline underlayer including at least one of CrMo, CrV, Cr, MoTa, MoW, MoV, CrW, Mo and RuAl and being a single layer;

an orientation control layer between the magnetic recording layer and the crystalline underlayer, the crystalline underlayer having a first lattice parameter, the orientation control layer having a second lattice parameter that differs from the first lattice parameter by not more than ten percent; and

a crystalline heat sink layer having a second crystal structure, the crystalline underlayer being between the crystalline heat sink layer and the magnetic recording layer, the crystalline heat sink layer consisting of at least one of Au, V, Cr, Nb and Ru;

wherein the crystalline underlayer adjoins and shares a first interface with the crystalline heat sink layer and wherein the orientation control layer adjoins and shares a second interface with the crystalline underlayer.

2. The magnetic recording media of claim 1 wherein the first crystal structure is the same as the second crystal structure.

3. The magnetic recording media of claim 2 wherein the first crystal structure is body-centered cubic.

4. The magnetic recording media of claim 1 wherein the crystalline underlayer has a thermal conductivity of at least 10 W/mK.

5. The magnetic recording media of claim 4 wherein the thermal conductivity is at least 10 W/mK as measured by time domain thermo-reflectance.

6. The magnetic recording media of claim 5 wherein the thermal conductivity is at least 20 W/mK as measured by the time domain thermo-reflectance and wherein the crystalline heat sink layer has a heat sink thermal conductivity greater than the thermal conductivity of the crystalline underlayer.

7. The magnetic recording media of claim 1 wherein the orientation control layer includes crystalline MgO having an orientation of (200).

8. The magnetic recording media of claim 1 wherein the second lattice parameter differs from the first lattice parameter by not more than four percent.

9. The magnetic recording media of claim 8 wherein the second lattice parameter differs from the first lattice parameter by not more than two percent.

10. The magnetic recording media of claim 1 further comprising:

an adhesion layer; and

a seed layer residing on the adhesion layer and between the adhesion layer and the crystalline heat sink layer.

11. The magnetic recording media of claim 10 wherein the seed layer includes at least one of RuAl, RuTi, Cr and NiAl.

12. A magnetic recording media usable in a heat assisted magnetic recording (HAMR) disk drive, the magnetic recording media comprising:

an adhesion layer;

a seed layer residing on, adjoining and sharing a first interface with the adhesion layer, the seed layer and including at least one of RuAl, RuTi, Cr and NiAl;

a crystalline heat sink layer having a body-centered cubic (BCC) structure, the seed layer being between the adhesion layer and the crystalline heat sink layer, the heat sink layer including at least one of Au, V, Cr, Nb and Ru, the seed layer adjoining and sharing a second interface with the crystalline heat sink layer;

a crystalline underlayer having the BCC structure and including at least one of CrMo, CrV, Cr, MoTa, MoW, MoV, CrW, Mo and RuAl, the crystalline underlayer being a single layer and adjoining and sharing a third interface with the crystalline heat sink layer;

an orientation control layer including crystalline MgO having a (200) orientation, the crystalline underlayer being between the crystalline heat sink layer and the orientation control layer, the orientation control layer adjoining and sharing a fourth interface with the crystalline underlayer;

a magnetic recording layer for storing magnetic data, the magnetic recording layer including FePt having a (001) orientation and adjoining and sharing a fifth interface with the orientation control layer; and

an overcoat layer including diamond-like carbon, the magnetic recording layer being between the overcoat layer and the orientation control layer.

13. A heat assisted magnetic recording (HAMR) disk drive comprising:

a media including a magnetic recording layer, a crystalline underlayer, an orientation control layer between the magnetic recording layer and the crystalline underlayer and a crystalline heat sink layer, the magnetic recording layer for storing magnetic data, the crystalline underlayer having a first crystal structure, the crystalline heat sink layer having a second crystal structure, the crystalline underlayer being between the crystalline heat sink layer and the magnetic recording layer, the crystalline underlayer having a first lattice parameter, the orientation control layer having a second lattice parameter that differs from the first lattice parameter by not more than ten percent, the crystalline heat sink layer consisting of at least one of Au, V, Cr, Nb and Ru, the crystalline underlayer including at least one of CrMo, CrV, Cr, MoTa, MoW, MoV, CrW, Mo and RuAl and being a single layer, the crystalline underlayer adjoining and sharing a first interface with the crystalline heat sink layer and the orientation control layer adjoining and sharing a second interface with the crystalline underlayer;

a laser for providing energy;

a slider including a HAMR write transducer, the HAMR transducer having air-bearing surface (ABS), a main pole, a waveguide and at least one coil, the main pole being configured to write to a region of the media, the waveguide being optically coupled with the laser and directing a portion of the energy toward the ABS, the at least one coil for energizing the main pole.

14. A method for fabricating a magnetic recording media usable in a heat assisted magnetic recording (HAMR) disk drive, the method comprising:

providing a crystalline heat sink layer having a first crystal structure on a substrate, the crystalline heat sink layer consisting of at least one of Au, V, Cr, Nb and Ru;

providing a crystalline underlayer on the crystalline heat sink layer, the crystalline underlayer having a second crystal structure, the crystalline underlayer including at least one of CrMo, CrV, Cr, MoTa, MoW, MoV, CrW, Mo and RuAl and being a single layer;

providing an orientation control layer between the magnetic recording layer and the crystalline underlayer, the crystalline underlayer having a first lattice parameter, the orientation control layer having a second lattice parameter that differs from the first lattice parameter by not more than ten percent, the crystalline underlayer adjoining and sharing a first interface with the crystalline heat sink layer and the orientation control layer adjoining and sharing a second interface with the crystalline underlayer; and

providing a magnetic recording layer for storing magnetic data, the crystalline underlayer being between the crystalline heat sink layer and the magnetic recording layer.

15. The method of claim 14 wherein the first crystal structure and the second crystal structure are each body-centered cubic.

16. The method of claim 14 wherein the crystalline underlayer includes at least one of CrMo, CrV, Cr, MoTa, MoW, MoV, CrW, Mo and RuAl.

17. The method of claim 14 further comprising:

providing an adhesion layer; and

providing a seed layer residing on the adhesion layer and between the adhesion layer and the crystalline heat sink layer, the seed layer including at least one of RuAl, RuTi, Cr and NiAl; and

providing an orientation control layer between the magnetic recording layer and the crystalline underlayer, the orientation control layer including crystalline MgO having an orientation of (200).

18. A method for fabricating a magnetic recording media usable in a heat assisted magnetic recording (HAMR) disk drive, the method comprising:

providing an adhesion layer;

providing a seed layer residing on and sharing a first interface with the adhesion layer;

providing a crystalline heat sink layer having a first crystal structure on a substrate, the seed layer being between the adhesion layer and the crystalline heat sink layer, the seed layer including at least one of RuAl, RuTi, Cr and NiAl, the seed layer adjoin and sharing a second interface with the crystalline heat sink layer, the crystalline heat sink layer consisting of at least one of Au, V, Cr, Nb and Ru;

providing a crystalline underlayer on, adjoining and sharing a third interface with the crystalline heat sink layer, the crystalline underlayer having a second crystal structure and being a single layer;

providing an orientation control layer including crystalline MgO having an orientation of (200), the orientation control layer adjoining and sharing a fourth interface with the crystalline underlayer; and

providing a magnetic recording layer for storing magnetic data, the crystalline underlayer being between the crystalline heat sink layer and the magnetic recording layer, the orientation control layer being between the magnetic recording layer and the crystalline underlayer, the magnetic recording layer adjoining the orientation control layer;

wherein the crystalline underlayer has a first lattice parameter, the orientation control layer has a second lattice parameter that differs from the first lattice parameter by not more than two percent.

19. The method of claim 14 wherein the crystalline underlayer has a thermal conductivity of at least 10 W/mK as measured by time domain thermo-reflectance.

Assignments (9)